Move LangStandard*, InputKind::Language to Basic

This patch is a prerequisite for using LangStandard from Driver in
https://reviews.llvm.org/D64793.

It moves LangStandard* and InputKind::Language to Basic.  It is mostly
mechanical, with only a few changes of note:

- enum Language has been changed into enum class Language : uint8_t to
  avoid a clash between OpenCL in enum Language and OpenCL in enum
  LangFeatures and not to increase the size of class InputKind.

- Now that getLangStandardForName, which is currently unused, also checks
  both canonical and alias names, I've introduced a helper getLangKind
  which factors out a code pattern already used 3 times.

The patch has been tested on x86_64-pc-solaris2.11, sparcv9-sun-solaris2.11,
and x86_64-pc-linux-gnu.

There's a companion patch for lldb which uses LangStandard.h
(https://reviews.llvm.org/D65717).

While polly includes isl which in turn uses InputKind::C, that part of the
code isn't even built inside the llvm tree.  I've posted a patch to allow
for both InputKind::C and Language::C upstream
(https://groups.google.com/forum/#!topic/isl-development/6oEvNWOSQFE).

Differential Revision: https://reviews.llvm.org/D65562

llvm-svn: 367864

2 files changed, 46 insertions, 0 deletions

diff --git a/clang/lib/Basic/CMakeLists.txt b/clang/lib/Basic/CMakeLists.txt
index 18dd7d61fbb..b4d6ced4d5f 100644
--- a/clang/lib/Basic/CMakeLists.txt
+++ b/clang/lib/Basic/CMakeLists.txt
@@ -50,6 +50,7 @@ add_clang_library(clangBasic
   FixedPoint.cpp
   IdentifierTable.cpp
   LangOptions.cpp
+  LangStandards.cpp
   Module.cpp
   ObjCRuntime.cpp
   OpenMPKinds.cpp
diff --git a/clang/lib/Basic/LangStandards.cpp b/clang/lib/Basic/LangStandards.cpp
new file mode 100644
index 00000000000..ee27bfd1211
--- /dev/null
+++ b/clang/lib/Basic/LangStandards.cpp
@@ -0,0 +1,45 @@
+//===--- LangStandards.cpp - Language Standard Definitions ----------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Basic/LangStandard.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/Support/ErrorHandling.h"
+using namespace clang;
+
+#define LANGSTANDARD(id, name, lang, desc, features)                           \
+  static const LangStandard Lang_##id = {name, desc, features, Language::lang};
+#include "clang/Basic/LangStandards.def"
+
+const LangStandard &LangStandard::getLangStandardForKind(Kind K) {
+  switch (K) {
+  case lang_unspecified:
+    llvm::report_fatal_error("getLangStandardForKind() on unspecified kind");
+#define LANGSTANDARD(id, name, lang, desc, features) \
+    case lang_##id: return Lang_##id;
+#include "clang/Basic/LangStandards.def"
+  }
+  llvm_unreachable("Invalid language kind!");
+}
+
+LangStandard::Kind LangStandard::getLangKind(StringRef Name) {
+  return llvm::StringSwitch<Kind>(Name)
+#define LANGSTANDARD(id, name, lang, desc, features) .Case(name, lang_##id)
+#define LANGSTANDARD_ALIAS(id, alias) .Case(alias, lang_##id)
+#include "clang/Basic/LangStandards.def"
+      .Default(lang_unspecified);
+}
+
+const LangStandard *LangStandard::getLangStandardForName(StringRef Name) {
+  Kind K = getLangKind(Name);
+  if (K == lang_unspecified)
+    return nullptr;
+
+  return &getLangStandardForKind(K);
+}
+
+